Valence Control and Solvent Extraction of Americium in the Presence of Ammonium Phosphotungstate

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Fundamental investigations on valence control and solvent extraction of americium were carried out to develop a method for americium separation from reprocessing solution. In order to adjust americium valency from III to IV and VI, (NH<SUB>4</SUB>)<SUB>10</SUB>P<SUB>2</SUB>W<SUB>17</SUB>O<SUB>61</SUB> synthesized was used as complexant stabilizing Am(IV). Oxidation behavior of americium was investigated as a function of (NH<SUB>4</SUB>)<SUB>10</SUB>P<SUB>2</SUB>W<SUB>17</SUB>O<SUB>61</SUB> to americium ratio. Using 0.1M (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>8</SUB> and 0.01M AgNO<SUB>3</SUB> as oxidation reagent, Am(IV) was obtained quantitatively at the ratio of 15. On decreasing the ratio to 0.6, 92% of americium was adjusted to Am(VI). The concentration of (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>8</SUB> could be reduced to 1/15 compared to the previously reported method in which no complexant was used. Americium(IV) was also prepared by reacting O<SUB>3</SUB> and AgNO<SUB>3</SUB> but no Am(VI) was obtained even at low (NH<SUB>4</SUB>)<SUB>10</SUB>P<SUB>2</SUB>W<SUB>17</SUB>O<SUB>61</SUB> to americium ratio.<BR>Americium(VI) could be extracted by tri-n-butyl phosphate stably without influence of (NH<SUB>4</SUB>)<SUB>10</SUB>P<SUB>2</SUB>W<SUB>17</SUB>O<SUB>61</SUB>. The distribution coefficient of Am(VI) was 4 between 100% tri-n-butyl phosphate and 1M nitric acid, and separation factor from Nd(III) was 50.<BR>With regard to the americium separation method which implemented valence control followed by extraction, adding (NH<SUB>4</SUB>)<SUB>10</SUB>P<SUB>2</SUB>W<SUB>17</SUB>O<SUB>61</SUB> led to minimization of waste volume and improvement of extraction efficiency.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(3), 185-189, 1998-03-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079123
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4440343
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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